|Table of Contents|

Application of Borehole Transient Electromagnetic Pseudo-seismic Inversion Method in Goaf Fine Detection of Open-pit Coal Mine(PDF)

《地球科学与环境学报》[ISSN:1672-6561/CN:61-1423/P]

Issue:
2020年第06期
Page:
759-766
Research Field:
电磁法勘探专辑
Publishing date:

Info

Title:
Application of Borehole Transient Electromagnetic Pseudo-seismic Inversion Method in Goaf Fine Detection of Open-pit Coal Mine
Author(s):
FAN Tao1; 2;  LI Hong-tai3;  GUO Jian-lei1; 2;  LI Bo-fan1;  ZHAO Rui1;  WANG Bing-chun1;  YAO Wei-hua1;  LI Yu-teng1;  LIU Lei1
1. CCTEG Xi'an Research Institute, Xi'an 710077, Shaanxi, China; 2. Integrated Geophysical Simulation Lab (Key Laboratory of Chinese Geophysical Society), Chang'an University, Xi'an 710054, Shaanxi, China; 3. The Geological Prospecting Team of Sichuan Geological and Mineral Bureau, Chengdu 610072, Sichuan, China
Keywords:
open-pit coal mine;  borehole transient electromagnetic method;  wavefield inverse transformation;  full waveform inversion;  conjugate gradient method;  pseudo-seismic inversion;  three-dimensional numerical simulation;  goaf
PACS:
P631
DOI:
10.19814/j.jese.2020.06007
Abstract:
There are numerous small colliery goafs under open-pit coal mine, which put great threats to safety of coal mine production and life. Affected by the surface environment of open-pit coal mine, conventional geophysical methods have poor accuracy in detecting goafs. Borehole transient electromagnetic method is a high-precision detection method, which belongs to a dynamic source and dynamic reception operating procedure. In order to improve data processing accuracy, the wavefield inverse transformation algorithm of sliding time window was adopted to preforming data high precision wavefield conversion. The conjugate gradient method was used to study the quasi-acoustic medium full waveform inversion algorithm for transient electromagnetic virtual wavefield data, and the borehole transient electromagnetic data pseudo-seismic inversion was realized. The inversion results of three-dimensional numerical model data show that the favorable imaging effect for the small-scale anomalous body on the radial direction of the borehole can be acquired. In order to test the practicability and availability of the operating method in detecting shape, characteristics and scale of water-logged goaf roadway, the engineering practice of an open-pit coal mine in Shuozhou area of Shanxi was conducted. The results show that the borehole transient electromagnetic detection method is a great combination and complementary of mine geophysical exploration technology and drilling technology. The pseudo-seismic inversion method is an effective application in goaf fine detection data interpretation of open-pit coal mine.

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Last Update: 2020-12-20